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content/post/20220301-gcc-flags/index.md

@@ -40,7 +40,18 @@ categories = []
 
 +++
 
-The summaries are taken from https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
+C++ is hard; make it a little bit easier.
+The summaries are taken from https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html.
+
+The effectiveness of some of these options depends on various optmization passes.
+You may also be able to selectively disable warnings for certain chunks of code (https://gcc.gnu.org/onlinedocs/gcc/Diagnostic-Pragmas.html)
+
+```c++
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wuninitialized"
+  foo(b);                       /* no diagnostic for this one */
+#pragma GCC diagnostic pop
+```
 
 * `-Wall`: turns on many warnings, but not "all."
 * `-Wextra`: turns on even more warnings, but still not all.